Spring nut-lock washer



-W 19290 H. G. NORWOOU 703,799

SPRING NUT LOCK WASHER Filed Sept. 24,. 1927 6. O /z-M I and is so constructed that the resiliency or.

Patented Apr. 9, 1929.

,I 1,708,799. UNITED STATES PATENT OFFICE.

HARRY G. NOBWOOD, OF BALTIMORE, ILLARYLAN D.

srame NUT-LOCK WASHER.

This. invention relates to an improved and novel nut lock washer of the split spring type spring of the washer serves to efiectively resist the force of compression and to take u the slack usually bolt.

The prime object of the invention is to procaused by stretching the vlde a simple, economical, durable and thor- 'when it is formed into and compressed tightly down upon the work the was oughly efiiclent spring nut lock washer, adapted to efiectively prevent the nut from loosening or unscrewing when subjected to undue strains and vibrations of various kinds.

Another object of the invention is to so construct my improved washer, that it will normally be substantially S-shaped in cross section throughout its entire length, so that an annular washer er will expand circumferentially resulting in a slight morease in its diameter. It is well known in this art that it often occurs when the railwaytrackmen are apply ing the securing nuts and bolts to a railwa jo nt the nuts are set too tightly thereby stretching the bolt, thus ren ering ineffective the ordinary washer now emplo ed, while with the use of my improved was ,ler, when the bolt stretches under high pressure, the S-shape cross-section of the washer Wlll spring back to its normal shape, taking up all slack, and holding the nut firmly at any position it may be resting.

The foregoing and such other ob] ects as may appear from the ensuing description are attaine by the constructlon, arran ement and location of my improved washer hereinafter more fully described, illustrating by the accompanying drawings, and particu-' part of this specification it will be seen that Figure 1 1s a perspective view showin a bar of spring steel from which the was er embodying my invention is formed.

Figure 2 is a plan showing the washer embodying my invention ready for use. a

Figure 3 is a side elevation of the same.

Fi the p an of the dotted lines 4-4, Fig. 2.

p in section showing the bolt in a re 4 is a transverse section taken in Figure 5 is a part elevation and partl in sectlon showing the washer compressed Into a fiat condition, and

Figure 6 is a part elevation and partly slightly stretched condition with the washer in its normal shape.

In the embodiment of my invention as illustrated it will be seen that in Fig. 1 the numeral 1 designates a bar of suitable dimen- SIODS formed from high carbon tool steel, hot rolled, or cold drawn and from which my novel washer is formed on a mandrel and cut into the form, such as shown in Figures 2, 3 and 4.

It will be perceived that the bar 1 is formed into an S-shape entirely throughout its length, so that when bent into annular form for use, it will be in S-shape transversely, as already shown at-2, in Fig. 4, at any and all points in its formation. This normal S-section formation, when tempered pro erly, will tend to spring back to its normal sl lape after y it has been compressed by a nut 3, as shown y reference to Fig. 3, it will be seen that the edge view illustrates the s lit portions 5 of the washer at opposite ang es, said portions being compressed together in a flattened condition whn under pressure, and when the washer is compressed completely by setting the nut tightly against it, the said washer will become flattened and expand circumferentially, as shown in Fig. 5, thereby resulting in a slight increase in its diameter, and Will contract when relieved of high pressure and assume its normal S-shape formation in cross-section.

. It will be readily obvious that this particular shape and formation of washer can be cold-punched, hot-punched or forged, or otherwise formed in any suitable or desirable manner.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: 1. A spring nut lock washer formed from a bar of spring steel having an S-shape in transverse cross section throughout its en tire length with its adjacent end bent in opposite directions.

2. A spring nut lock washerformed from a bar of suitable steel, and bent into an an- I -nular form with the adjacent end portions bent in opposite directions, saidwasher bein S shape in transverse cross-section at-all points thereof. v

3. A split springmnut lock washer of spiral form with an S-s ape formation in transverse cross-section throughout its entire forportions mation and with its adjacent end portions bent in ppposite directions.

tions, said washer being adapted to expand oircumferentially when'vunder high pressure, and to contract when the high pressure is relieved.

HARRY G. NORWOOD. 

